Cooling fan

ABSTRACT

A cooling fan, includes a hub ( 40 ) and a plurality of blades ( 50 ) extending radially from the hub. Each of the blades is divided into a plurality of zonal zones ( 505, 51, 52, 53, 54, 55, 56 ), projections of a plurality of homocentric rounds concentric with the hub on the blades are defined as boundaries of the zones. The zones are coated with a painted layer with different colors to present a rainbow-liked image when the fan is in operation.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a cooling fan, and more particularly to a cooling fan having a fantastic visual effect when the fan is in operation.

2. Description of Related Art

Nowadays, cooling fans are commonly used in many fields such as heat dissipation device for CPUs in computers. With the fast and prosperous development of computer and information technologies, designs related to computers, typically for cooling fans are continuously updated. The demands upon cooling fans are no longer limited to rigid, invariable structures.

Typically, a cooling fan used for cooling CPUs in a computer includes a housing and a rotor received in the housing. A plurality of light emitting diodes with different colors is arranged on the housing. When the rotor rotates, the light emitting diodes project lights with different colors to the rotor. Thus, a special visual effect is provided when the cooling fan is in operation. However, the cooling fan with light emitting diodes has a complex structure, which increasing the cost of the cooling fan. Furthermore, the light projected by the light emitting diodes is so glare that may be a light contamination.

What is needed, therefore, is an improved cooling fan which can overcome the above problems.

SUMMARY OF THE INVENTION

A cooling fan, includes a hub and a plurality of blades extending radially from the hub. Each of the blades is divided into a plurality of zonal zones, projections of a plurality of homocentric circles concentric with the hub on the blades are defined as boundaries of the zones. The zones are coated with a painted layer with different colors to present a rainbow-liked image when the fan is in operation.

Other advantages and novel features of the present cooling fan will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present cooling fan can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present cooling fan. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is an assembled, isometric view of a cooling fan, in accordance with a first preferred embodiment of the present invention;

FIG. 2 is a top plan view of the cooling fan of FIG. 1;

FIG. 3 is a partial enlarged view of the cooling fan of FIG. 2; and

FIG. 4 is a partial enlarged view of a cooling fan in accordance with a second preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1-3, a cooling fan in accordance with a first preferred embodiment of the invention is shown. The fan comprises a housing 20 and a rotor 30 received in the housing 20. In this embodiment, the cooling fan is used in a computer for dissipating heat generating electronic elements such as CPUs. Understandably, the present invention can be other types of cooling fans.

The housing 20 is approximately square-shaped with a cylindrical receiving space defined therein for receiving the rotor 30 and a stator (not shown) of the fan. A supporting base (not shown) is arranged in a bottom side of the housing 20. Four ribs 21 connect the housing 20 and the supporting base. The rotor 30 and the stator of the fan are received in the housing 20 and mounted to the supporting base.

The rotor 30 comprises a cylindrical hub 40 and a plurality of blades 50 extending radially from an outer periphery of the hub 40. Each of the blades 50 is divided into seven zonal zones 505, 51, 52, 53, 54, 55, 56. Boundaries 500 among the zonal zones 505, 51, 52, 53, 54, 55, 56 are projections of a plurality of homocentric circles concentric with a center 400 of the hub 40 to the blades 50. Each of the zones 505, 51, 52, 53, 54, 55, 56 has an equal radial width to each other. The zones 505, 51, 52, 53, 54, 55, 56 are arranged on each of the blades 50 in series along a radial direction. The zone 505 is the nearest zone to the hub 40 and the zone 56 is the furthest zone to the hub 40. The zone 505 is near the outer periphery of the hub 40.

A painted layer with different colors is coated on a top surface of each of the blades 50. Specifically, the color of the painted layer on the zone 51 is purple, the color of the painted layer on the zone 52 is blue, the color of the painted layer on the zone 53 is green, the color of the painted layer on the zone 54 is yellow, the color of the painted layer on the zone 55 is orange, and the color of the painted layer on the zone 56 is red. The zone 505 retains original appearance without any color coated. In other words, the colors of the painted layer on each of the blades 50 are arranged in an order like a rainbow which contains purple, blue, green, yellow, orange and red. The painted layer can be made of fluorescent material which painted on the surface of the blades 50. Alternatively, the painted layer can be a painted polymeric film which adhered to the surface of the blades 50.

When the fan is in operation, as the blades 50 rotate rapidly, the painted layer on the blades 50 form a ring-shaped colorful image, which looks like a rainbow. Thus, a fantastic visual effect is present in a top plan view of the fan by the painted layer on the blades 50. As the zone 505 is uncoated any color, thus inner side of the zone 51 is spaced apart from the out periphery of the hub 40, the rainbow-liked image will be present completely, and not interfered by the out periphery of the hub 40.

The blades 50 can be made of transparent or translucent material. Thereby, the painted layer on the top surface of the blades 50 can be seem in a bottom view of the fan and the rainbow-liked image can also be seen at a bottom side of the fan when the fan is in operation.

FIG. 4 shows a second embodiment of a cooling fan according to the present invention. Compared with the first embodiment, each of the blades 50 is divided into ten zonal zones 505, 51 a, 51 b, 52, 53 a, 53 b, 54, 55 a, 55 b, 56. The zone 51 in the first embodiment is replaced by two zonal zones 51 a, 51 b, a size of which is equal to each other. The zone 53 in the first embodiment is replaced by two zonal zones 53 a, 53 b, a size of which is equal to each other. The zone 55 in the first embodiment is replaced by two zonal zones 55 a, 55 b, a size of which is equal to each other. A boundary 501 between the zone 51 a and 51 b, the zone 53 a and 53 b, the zone 55 a and 55 b is a radial line along an extending direction of the blades 50 between two lateral flanges of the blades 50. The color of the painted layer on the zone 51 a is red, and the color of the painted layer on the zone 51 b is blue. The color of the painted layer on the zone 53 a is blue, and the color of the painted layer on the zone 53 b is yellow. The color of the painted layer on the zone 55 a is yellow, and the color of the painted layer on the zone 55 b is red. Other structures and characteristics of the fan in the present embodiment are the same with the fan in the first embodiment. Thereby a detailed description is omitted.

As is known, a color of red mixed with a color of yellow can obtain a color of orange, a color of yellow mixed with a color of blue can obtain a color of green, and a color of blue mixed with a color of red can obtain a color of purple. When the blades 50 rotate rapidly, the zone 51 a with a red painted layer cooperatives with the zone 51 b with a blue painted layer in a same circumference direction to present a color of purple, the zone 53 a with a blue painted layer cooperatives with the zone 53 b with a yellow painted layer to present a color of green, and the zone 55 a with a yellow painted layer cooperatives with the zone 55 b with a red painted layer to present a color of orange. Thus, the painted layer on the surface of each of the blades 50 with three colors, i.e., red, yellow, and blue, can also provide a fantastic rainbow-liked image when the fan is in operation. Understandably, the colors of the painted layer on the zone 31 a and 31 b, on the zone 33 a and 33 b, on the zone 35 a and 35 b can be changed into each other.

It is believed that the present invention and its advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention. 

1. A cooling fan, comprising a hub and a plurality of blades extending radially from the hub, each of the blades being divided into a plurality of zonal zones, projections of a plurality of homocentric circles concentric with a center of the hub on the blades being defined as boundaries of the zones, the zones being coated with a painted layer with different colors to present a rainbow-liked image when the fan being in operation.
 2. The cooling fan as claimed in claim 1, wherein each of the blades is divided into first, second, third, fourth, fifth, sixth and seventh zones.
 3. The cooling fan as claimed in claim 2, wherein the first zone is the nearest zone to the hub and uncoated any color, the seventh zone is the furthest zone to the hub.
 4. The cooling fan as claimed in claim 3, wherein the color of the painted layer on the second, third, fourth, fifth, sixth and seventh zones is purple, blue, green, yellow, orange and red, respectively.
 5. The cooling fan as claimed in claim 3, wherein the second, fourth and sixth zones are divided into two parts by a radial line, and the color of the painted layer on the two parts of the second zone is red and blue, the color of the painted layer on the two parts of the fourth zone is blue and yellow, the color of the painted layer on the two parts of the sixth zone is yellow and red, and the color of the painted layer on the third, fifth and seventh zones is blue, yellow and red, respectively.
 6. The cooling fan as claimed in claim 5, wherein the second, fourth and sixth zones are divided into two even parts.
 7. The cooling fan as claimed in claim 1, wherein a radial width of each of the zones is equal to each other.
 8. The cooling fan as claimed in claim 1, wherein the painted layer is made of fluorescent material.
 9. The cooling fan as claimed in claim 1, wherein the painted layer is a painted polymeric film.
 10. The cooling fan as claimed in claim 1, wherein the painted layer is coated on one surface of the blades.
 11. The cooling fan as claimed in claim 1, wherein the blades are made of transparent or translucent material.
 12. The cooling fan as claimed in claim 1, further comprising a housing for receiving the hub and the blades.
 13. A cooling fan, comprising: a frame; and a rotor received in the frame, the rotor having a hub and a plurality of blades extending radially from an outer periphery of the hub, each of the blades being divided into a plurality of zones coated different colors.
 14. The cooling fan as claimed in claim 13, wherein the zones are zonary.
 15. The cooling fan as claimed in claim 14, wherein projections of the zones are segments of a plurality of homocentric circles concentric with a center of the hub.
 16. The cooling fan as claimed in claim 15, wherein every two adjacent zones are covered different colors.
 17. The cooling fan as claimed in claim 15, wherein one of the zones is coated two different colors and another zone adjacent to the one of the zones is coated another color. 